This easy to install oil pressure gauge kit comes with a non-flexible chrome plated steel oil line that is connected to the oil pressure switch hole which is located on the right hand side of the crankcase. The oil pressure gauge is fitted on a bracket that mounts under the rear rocker cover bolt (longer rocker cover bolt may be required). If you do not want to give up your instrument or dash mounted oil pressure light a dual oil pressure gauge adapter ZPN234735 or 234736 must be used. Available as a complete kit including our ZPN169050 oil pressure gauge or as a oil line and fitting kit only. Fits 1984 thru 1999 Evolution Big Twin models.